Our 2.0tdi DSG 2005 Golf was cheaper around town as well as on longer tours. When not going faster than speed limits the VW used 5 on highways on tour from Spain to Denmark. Never tried that in our CT, but believe it could be close. In town where we live the Golf was around 5.5 and always less than 6. The CT never come down to 6 in town. Mostly 6.5 - 7.
The hills here are not good for hybrid as going down just a short while and the hybrid battery is full and power is from there of wasted when braking, while going up the engine is running constant.
Here diesel is cheaper than gasoline.
There are other drawbacks on the diesel such as black smoke coming from exhaust pipe when going up, but with no other interests than consumption, diesel win here.
Not fair to compare a 2005 diesel with a 2016 hybrid. Comfort the CT win 10 to 0.
Have had many other cars, but before fuel was something put in the tank when needed. After retiring economy does count also.